<template>
  <el-breadcrumb
    class="app-breadcrumb"
    separator-class="el-icon-arrow-right"
    style="height: 46px; line-height: 24px"
  >
    <transition-group name="breadcrumb">
      <el-breadcrumb-item v-for="(item, index) in levelList" :key="item.path">
        <span
          v-if="item.redirect === 'noRedirect' || index == levelList.length - 1"
          class="no-redirect"
          >{{ item.meta.title }}</span
        >
        <a v-else @click.prevent="handleLink(item)" class="a-redirect">{{
          item.meta.title
        }}</a>
      </el-breadcrumb-item>
    </transition-group>
  </el-breadcrumb>
</template>

<script>
export default {
  data() {
    return {
      levelList: null,
    };
  },
  watch: {
    $route(route) {
      // if you go to the redirect page, do not update the breadcrumbs
      if (route.path.startsWith("/redirect/")) {
        return;
      }
      this.getBreadcrumb();
    },
  },
  created() {
    this.getBreadcrumb();
  },
  methods: {
    getBreadcrumb() {
      // only show routes with meta.title
      let matched = this.$route.matched.filter(
        (item) => item.meta && item.meta.title
      );
      const first = matched[0];

      // if (!this.isDashboard(first)) {
      //   matched = [{ path: '/index', meta: { title: '首页' }}].concat(matched)
      // }

      this.levelList = matched.filter(
        (item) => item.meta && item.meta.title && item.meta.breadcrumb !== false
      );
    },
    isDashboard(route) {
      const name = route && route.name;
      if (!name) {
        return false;
      }
      return name.trim() === "Index";
    },
    handleLink(item) {
      const { redirect, path } = item;
      if (redirect) {
        this.$router.push(redirect);
        return;
      }
      this.$router.push(path);
    },
  },
};
</script>

<style lang="scss" scoped>
.app-breadcrumb.el-breadcrumb {
  display: inline-block;
  font-size: 14px;
  line-height: 50px;
  //margin-left: 8px;
  padding-left: 0px;
  height: 50px;
  width: 100%;
  background: transparent;
  //border-bottom: 1px solid #d8dce5;
  //box-shadow: 0 1px 3px 0 rgba(0, 0, 0, .12), 0 0 3px 0 rgba(0, 0, 0, .04);

  .no-redirect {
    cursor: text;
    font-size: 14px;
    font-family: Microsoft YaHei-Regular, Microsoft YaHei;
    font-weight: 400;
    color: #666;
  }

  .a-redirect {
    font-size: 14px;
    font-family: Microsoft YaHei-Regular, Microsoft YaHei;
    font-weight: 400;
    color: #333333;
  }

  ::v-deep .el-breadcrumb__separator {
    font-size: 12px;
    font-family: Microsoft YaHei-Regular, Microsoft YaHei;
    font-weight: 400;
    color: #666;
    margin: 0;
  }
}
</style>
